There's a good discussion over at SevenForums.com (sorry can't post links yet) but if you search for this topic you should get the thread.
[h=1]Windows 7: WinSXS Folder not actually consuming lots of space[/h]There are many threads here on MDL as well on how to reduce the size, just search for winsxs and lots show up. There are a few command line utilities that will remove some files, but at the end of the day, there's not too much you can do about it.

There's a good discussion over at SevenForums.com (sorry can't post links yet) but if you search for this topic you should get the thread.
[h=1]Windows 7: WinSXS Folder not actually consuming lots of space[/h]There are many threads here on MDL as well on how to reduce the size, just search for winsxs and lots show up. There are a few command line utilities that will remove some files, but at the end of the day, there's not too much you can do about it.

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I tried search before and got only for Windows 7, i need for Windows Vista SP2. Anyway, i tried search and found in :
http://forums.mydigitallife.info/threads/32744

They said

With Windows Vista, the WinSXS folder was able to be cleaned up via a third party tool. With the initial release of Windows 7, we lost that capability – but it has since returned with Service Pack 1.

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What's 3rd party apps can do that. i tried tune Up utilities trial and it only capable cleanup downloaded update files, not winSxS :-/